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The '''National Security Agency''' ('''NSA''') is a national-level intelligence agency of the United States Department of Defense, under the authority of the Director of National Intelligence. The NSA is responsible for global monitoring, collection, and processing of information and data for foreign intelligence and counterintelligence purposes, specializing in a discipline known as signals intelligence (SIGINT). The NSA is also tasked with the Information assurance|protection of U.S. communications networks and information systems. The NSA relies on a variety of measures to accomplish its mission, the majority of which are clandestine operations|clandestine.''Executive Order 13470 – [http://www.gpo.gov/fdsys/pkg/WCPD-2008-08-04/pdf/WCPD-2008-08-04-Pg1064.pdf 2008 Amendments to Executive Order 12333], United States Intelligence Activities'', July 30, 2008 (PDF) Originating as...
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